Ranking Islamic Jihad official Khader Adnan, who went on a 66-day hunger strike over his detention by Israel, has been released in keeping with the deal reached with him to end his hunger strike in February. One day before his release on Tuesday, some 2,300 Palestinian inmates in Israeli jails began an open-ended hunger strike, synchronized with Palestinian rallies marking "Prisoners' Day."

Khadar Adnan, a self-described leader of Islamic Jihad, is currently on a hunger strike against his administrative detention in an Israeli prison. Human rights groups are lining up to support him, solidarity marches are being held in his name, and the EU foreign policy chief has expressed her concern. But who really IS Khader Adnan?